add：添加文件路径支持拖入。

src/QCustomQLineEdit.cpp

@@ -0,0 +1,36 @@
+#include "QCustomQLineEdit.h"
+
+QCustomQLineEdit::QCustomQLineEdit(QWidget* parent) : QLineEdit(parent)
+{
+    setAcceptDrops(true);
+}
+
+void QCustomQLineEdit::dragEnterEvent(QDragEnterEvent* event)
+{
+    if (event->mimeData()->hasUrls()) {
+        event->acceptProposedAction();
+    }
+    QLineEdit::dragEnterEvent(event);
+}
+
+void QCustomQLineEdit::dragMoveEvent(QDragMoveEvent* event)
+{
+}
+
+void QCustomQLineEdit::dropEvent(QDropEvent* event)
+{
+    const QMimeData* mimeData = event->mimeData();
+    if (mimeData->hasUrls()) {
+        QList<QUrl> urls = mimeData->urls();
+        if (urls.size() > 0) {
+            QString file_name = urls.at(0).toLocalFile();
+            setText(file_name);
+            event->accept();
+        }
+    }
+    QLineEdit::dropEvent(event);
+}
+
+QCustomQLineEdit::~QCustomQLineEdit()
+{
+}

src/QCustomQLineEdit.h

@@ -0,0 +1,27 @@
+#ifndef QCUSTOMQLINE
+#define QCUSTOMQLINE
+
+#include <QLineEdit>
+
+#include <QDropEvent>
+#include <QMimeData>
+#include <QDragEnterEvent>
+
+class QCustomQLineEdit : public QLineEdit
+{
+    Q_OBJECT
+
+public:
+    QCustomQLineEdit(QWidget* parent = nullptr);
+    ~QCustomQLineEdit() override;
+
+protected:
+    // 拖动文件到窗口 触发
+    void dragEnterEvent(QDragEnterEvent* event);
+    // 拖动文件到窗口移动文件 触发
+    void dragMoveEvent(QDragMoveEvent* event);
+    // 拖动文件到窗口释放文件触发
+    void dropEvent(QDropEvent* event);
+};
+
+#endif